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From Cradle to Grave - Modelling the Rock-physics “Life Story” of a Sandstone
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 5
Abstract
Present-day rock-physics properties and associated seismic signatures are strongly affected by the geological “life cycle” of sedimentary rocks. By honouring the geological processes, the rock physics modelling will be more predictive in an explorational setting. We have investigated porosity-velocity trends of sandstones associated with geological processes starting from deposition to mechanical compaction and chemical compaction. We have combined compaction models with rock physics contact theory, and shown how different geological factors, including sorting, grain size and clay coating, will affect the observed trends. The geologically-consistent modification of rock physics diagnostics, honouring both mechanical and chemical compaction, makes the contact theory models more consistent with the Vernik-Kashanov sandstone diagenesis model.